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Cobalt-nickel alloy-porous carbon composite wave-absorbing material with MOF structure and preparation method thereof

A composite wave absorbing material and cobalt-nickel alloy technology, applied in the field of wave absorbing materials, can solve problems such as difficulty in realizing large-scale industrial production, and achieve the effects of good microwave absorption performance, high microwave absorption strength and simple process

Active Publication Date: 2019-05-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the methods for preparing these materials need to be divided into multiple steps, which is difficult to achieve for large-scale industrial production.

Method used

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  • Cobalt-nickel alloy-porous carbon composite wave-absorbing material with MOF structure and preparation method thereof
  • Cobalt-nickel alloy-porous carbon composite wave-absorbing material with MOF structure and preparation method thereof
  • Cobalt-nickel alloy-porous carbon composite wave-absorbing material with MOF structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The preparation method of the cobalt-nickel alloy-porous carbon composite wave-absorbing material of the present invention specifically comprises the following steps:

[0032] Step 1, weigh 263mg cobalt nitrate and 610mg nickel nitrate and dissolve in 60mL N,N-dimethylformamide, stir until cobalt nitrate and nickel nitrate are completely dissolved; then measure 3mmol trimellitic acid and 3mmol 4'4 - Add bipyridine to the above mixed solution, continue to stir for 30 minutes, transfer the above mixed solution to a high-pressure reactor, place it in a blast drying oven and heat it to 120°C, and keep it warm for 4 hours; after naturally cooling to room temperature, the obtained precipitate is centrifuged Separation, washing and drying to obtain a precursor in the MOF structure;

[0033] Step 2, put the precursor obtained in step 1 into a tube furnace under a nitrogen atmosphere and calcinate at 800°C for 2h with a heating rate of 2°C / min; after calcining, cool naturally to...

Embodiment 2

[0035] The preparation method of the cobalt-nickel alloy-porous carbon composite wave-absorbing material of the present invention specifically comprises the following steps:

[0036] Step 1, weigh 438mg cobalt nitrate and 316.5mg nickel nitrate and dissolve in 60mL N, N-dimethylformamide, stir until cobalt nitrate and nickel nitrate are completely dissolved; then measure 3mmol trimellitic acid and 3mmol 4' Add 4-bipyridine to the above mixed solution, continue to stir for 30 minutes, transfer the above mixed solution to a high-pressure reactor, place it in a blast drying oven and heat it to 120°C, and keep it warm for 4 hours; after naturally cooling to room temperature, remove the obtained precipitate Centrifuge and wash and dry to obtain a precursor in the form of MOF;

[0037] Step 2, put the precursor obtained in step 1 into a tube furnace and calcinate at 800°C for 2h under a nitrogen atmosphere, with a heating rate of 2°C / min; after calcining, naturally cool to obtain th...

Embodiment 3

[0039] The preparation method of the cobalt-nickel alloy-porous carbon composite wave-absorbing material of the present invention specifically comprises the following steps:

[0040] Step 1, weigh 613mg cobalt nitrate and 261mg nickel nitrate and dissolve in 60mL N,N-dimethylformamide, stir until cobalt nitrate and nickel nitrate are completely dissolved; then measure 3mmol trimesic acid and 3mmol 4'4 - Add bipyridine to the above mixed solution, continue to stir for 30 minutes, transfer the above mixed solution to a high-pressure reactor, place it in a blast drying oven and heat it to 120°C, and keep it warm for 4 hours; after naturally cooling to room temperature, the obtained precipitate is centrifuged Separation, washing and drying to obtain a precursor in the MOF structure;

[0041] Step 2, put the precursor obtained in step 1 into a tube furnace under a nitrogen atmosphere and calcinate at 800°C for 2h with a heating rate of 2°C / min; after calcining, cool naturally to ob...

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Abstract

The invention discloses a cobalt-nickel alloy-porous carbon composite wave-absorbing material with an MOF structure. The wave-absorbing material has a porous nanometer sheet structure, wherein a cobalt-nickel alloy particle is embedded into the pore structure; and a graphitized carbon layer is wrapped outside the cobalt-nickel alloy particle. The invention also discloses a preparation method for the above-mentioned cobalt-nickel alloy-porous carbon composite wave-absorbing material. The preparation method comprises the following steps: adding cobalt nitrate, nickel nitrate and trimesic acid with addition amounts larger than required amounts into DMF, after reaction materials are completely dissolved, adding 4'4-dipyridyl with an addition amount larger than a required amount into an obtained mixed solution, carrying out dissolving under full stirring, and carrying out a solvothermal reaction; washing a product obtained by the reaction, and carrying out drying so as to obtain a precursorwith the MOF structure; and subjecting the precursor to calcination treatment so as to obtain the cobalt-nickel alloy-porous carbon composite wave-absorbing material. The preparation method providedby the invention has the advantages of low preparation cost and simple process; and the composite wave-absorbing material prepared by using the preparation method provided by the invention has excellent wave-absorbing performance and is applicable to large-scale industrial production.

Description

technical field [0001] The invention relates to a cobalt-nickel alloy-porous carbon composite wave-absorbing material with an MOF structure, and also relates to a preparation method of the above-mentioned cobalt-nickel alloy-porous carbon composite wave-absorbing material, belonging to the technical field of wave-absorbing materials. Background technique [0002] With the rapid development of electromagnetic wave technology in civilian and military fields, such as the emerging new generation of miniaturized electronics, automobiles, radar and satellite communications, many serious electromagnetic interference problems have emerged in daily life. Therefore, high-performance electromagnetic wave absorbing materials have attracted much attention as an effective method to solve these problems. An ideal and efficient electromagnetic wave absorbing material should have the characteristics of strong absorption characteristics, wide absorption frequency range, thin matching thicknes...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 姬广斌梁小会权斌陈家彬
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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